-O Rappa	-O Surto
-O Town	-O-Town
-O-Zone	-O.A.R.
-O.A.R. (Of A Revolution)	-O.C.
-O.C. & DJ JS1	-O.C. Smith
-O.C. Supertones	-O.M.D
-O.M.D.	-O.P.M
-O'Kaysions	-O'Ryan
-Oak Ridge Boys	-Oakenfold
-OAR	-Oasis
-Obie Bermudez	-Obie Trice
-Obituary	-OBK
-Obliveon	-Oblivion Dust
-Obscure Disorder	-Obsession
-Obsidian Gate	-Obtained Enslavement
-Obtest	-Ocean
-OCEAN BLUE	-Ocean Colour Scene
-Oceano	-Oceans Of Sadness
-Octaves	-Octavia
-October 31	-October Project
-Oda	-Odds
-Odes Of Ecstasy	-Odetta
-Odia Coates	-Odious
-Odious Sanction	-Odyssey
-Of A Revolution	-Of The Wand And The Moon
-Off By One	-Off Topic
-Officer Negative	-Offset
-Offspring	-Oficina G3
-Ofra Haza	-OG Ron C
-Ogie Alcasid	-Oh Sixteen Oh Seven
-Ohio Express	-Ohio Players
-Oi Polloi	-Oingo Boingo
-OJays	-OK Go
-Oklahoma! Soundtrack	-Oktober
-Okuyatos	-Ol
-Ol	-Ol Skool
-Ola Magnell	-Old
-Old 97	-Old Dead Tree
-Old Man	-Old Man Gloom
-Old Mans Child	-Old Songs, Lullabies, Shanties etc.
-Oldies	-Oleander
-Oleta Adams	-Olexandr Ponomariov
-Olga Tanon	-Oliva Newton-John
-Olive	-Oliver
-Oliver Magnum	-Oliver! Soundtrack
-Olivia	-Olivia Newton-John
-Olivia Newton-John & John Farnham	-Olivia Newton-John & John Travolta
-Olivia Olson	-Olivia Project
-Olli P.	-Olsen Brothers
-Olsen Twins	-Olu Dara